Sadie bought 8 bottles of water and 2 muffins for $31. Molly bought 3 bottles of water and 3 muffins for $17.25. What is the difference in price of a bottle of water and a muffin?

Based on the figures as marked, /\rqs = —

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

What expression is equivalent to (84+16)